http://www.w3.org/TR/mwabp/

1. Use Cookies Sparingly
2. Use Appropriate Client-Side Storage Technologies for Local Data
3. Replicate Local Data
4. Do not Execute Unescaped or Untrusted JSON data
5. Ensure the User is Informed About Use of Personal and Device Information
6. Enable Automatic Sign-in
7. Use Transfer Compression
8. Minimize Application and Data Size
9. Avoid Redirects
10. Optimize Network Requests
11. Minimize External Resources
12. Aggregate Static Images into a Single Composite Resource (Sprites)
13. Include Background Images Inline in CSS Style Sheets
14. Cache Resources By Fingerprinting Resource References
15. Cache AJAX Data
16. Do not Send Cookie Information Unnecessarily
17. Keep DOM Size Reasonable
18. Optimize For Application Start-up Time
19. Minimize Perceived Latency
20. Design for Multiple Interaction Methods
21. Preserve Focus on Dynamic Page Updates
22. Use Fragment IDs to Drive Application View
23. Make Telephone Numbers “Click-to-Call”
24. Ensure Paragraph Text Flows
25. Ensure Consistency Of State Between Devices
26. Consider Mobile Specific Technologies for Initiating Web Applications
27. Use Meta Viewport Element To Identify Desired Screen Size
28. Prefer Server-side Detection Where Possible
29. Use Client-side Detection When Necessary
30. Use Device Classification to Simplify Content Adaptation
31. Support a non-JavaScript Variant if Appropriate
32. Offer Users a Choice of Interfaces
33. Consider Use Of Canvas Element or SVG For Dynamic Graphics
34. Inform the User About Automatic Network Access
35. Provide Sufficient Means to Control Automatic Network Access

http://www.w3.org/TR/mwabp/

“If you build your application with features based on a user’s location, make sure these features provide beneficial information, if your app uses location-based information primarily to enable mobile advertisers to deliver targeted ads based on a user’s location, your app will be returned to you by the App Store Review Team for modification before it can be posted to the App Store.”

Original article: developer.apple.com
I’m not too sure how this will affect existing applications or whether they’ll be pulled from the Appstore. But if you’re building mobile apps for the iPhone bear this in mind.